/**
 * Copyright (C) 2010, 2011 Neofonie GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.dicodeproject.analysis.histogram;

import java.io.IOException;

import org.apache.hadoop.hbase.mapreduce.TableReducer;
import org.apache.hadoop.io.IntWritable;

/**
 * Sums all the values assigned to pattern/bucket keys.
 */
public class HistogramReducer extends TableReducer<IntWritable, IntWritable, IntWritable> {

  private IntWritable result = new IntWritable(0);

  @Override
  protected void reduce(IntWritable keyin, Iterable<IntWritable> values, Context context) throws IOException,
      InterruptedException {
    int tmpResult = 0;
    for (IntWritable i : values) {
      tmpResult += i.get();
    }
    result.set(tmpResult);
    context.write(keyin, result);
  }

}
